nrf5340 bluetooth, network core

[mke]

Hello,

I am developing using nrf5340 and optimizing the Bluetooth throughput currently.

Although experiments go well, there are a few things I would like to know more about: the operation of the network core.

What my application does is send data using bt_gatt_notify, and bt_gatt_notify_cb. As I understand, the network core is supposed to handle the BT stack, right? So calling "notify" function is supposed to transfer the to be transmitted notification data to the network core if I have a correct understanding.

The question is, are there any configuration values to optimize the communication between two cores? Just want to make sure that I do not miss anything while optimizing. And how exactly is the communication handled between two cores while sending BT notifications? There are surely limited resources somewhere in the chain that could be tweaked, tuned? I want to perform some sort of test to make sure the bottleneck is not between inter-core communication. And if it is, want to understand the logic and possible tuning/trade-offs.

BR, Madis

[Turbo J]

Most of the tuning config is shown in the throughput sample code.

[mke]

Hello,

Thank you for the reply.

Yes, I have seen the throughput sample. Went through the configurations and tested those.

Can you please advise what exact settings tune the inter-core communication?

I also found topics on the configuration flag "CONFIG_BT_RPC_STACK": 

 RE: nRF5340 Network core and application core communication 

So, for the throughput sample, is the Bluetooth sample running on the network core? And how can I be sure that the inter-core communication is tuned to have its maximum capacity?

BR, Madis

[Hieu]

Hi Madis,

What is your main concern here regarding the communication between the two cores?

To my limited understanding, overall, these are the configs you most care about:
https://github.com/nrfconnect/sdk-nrf/blob/v3.2.3/samples/bluetooth/throughput/sysbuild/ipc_radio/prj.conf#L12-L17

mke said:

I also found topics on the configuration flag "CONFIG_BT_RPC_STACK": 

 RE: nRF5340 Network core and application core communication 

So, for the throughput sample, is the Bluetooth sample running on the network core? And how can I be sure that the inter-core communication is tuned to have its maximum capacity?

You will want to read that case and the links available there in more depth. The discussion is concerning the Bluetooth: Host for nRF RPC Bluetooth Low Energy sample, where the entire stack indeed runs on the Network core.

On the Throughput sample, only the Bluetooth Controller is located in the Network core. The Host and application are located in the Application core.

BR,

Hieu